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See detailBiothermodynamik: Wieso Bio?
Bronneberg, R; Pfennig, Andreas ULg

Conference (2011, May 05)

See detailExergetische Bewertung der Routen zur stofflichen Nutzung von Biomasse
Fayyaz, S; Frenzel, P; Hillerbrand, R et al

Conference (2011, May 05)

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See detailThe origin of Annex IV of the Regulation 428/2009
Michel, Quentin ULg

Conference (2011, May 04)

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See detailLes catécholamines et la tension artérielle
Krzesinski, Jean-Marie ULg

Conference (2011, May 04)

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See detailCombined utilization of DGTs and bioindicators to trace chemical contamination threats on coastal ecosystems
Richir, Jonathan ULg; Luy, Nicolas; Serpe, Pierre et al

Conference (2011, May 03)

Trace metal monitoring in marine organisms and their living habitats permit to trace chronic or acute contaminations of marine ecosystems due to human activities. While dissolved trace metal ... [more ▼]

Trace metal monitoring in marine organisms and their living habitats permit to trace chronic or acute contaminations of marine ecosystems due to human activities. While dissolved trace metal concentrations give us an overall and punctual view over biota contamination status, bioindicator species put their bioavailable and possible toxic fraction in an obvious. However, difficulties mainly inherent to metal measurements in seawater lead field ecotoxicologists to study marine pollution essentially through the use of bioindicators alone. The technique of diffusive gradients in thin films (DGT) for the measurement of trace metals in aqueous solutions was introduced in the mid-ninetieth by Davison and Zhang. This passive probe accumulates labile trace metal species in proportion to their bulk environmental concentrations by maintaining a negative gradient between the environment and an ion-exchange resin (Chelex). DGTs average natural water trace metal concentrations over the deployment period, concentrate them and avoid matrix interferences, notably due to dissolved salts in seawater. Their deployment in passive and experimental monitoring studies permits to reliably measure labile trace metal concentrations and, jointly analysed with bioindicators, to estimate their bioavailability to marine organisms. This combined approach DGT-bioindicator was investigated in Calvi Bay (Corsica) through three monitoring studies. (1) DGTs were deployed in Posidonia oceanica bed, a Mediterranean seagrass forming dense meadows from the surface down to 40 meters depth, to study seasonal, spatial and bathymetrical variations of labile trace metal concentrations within this meadow. These concentrations were analysed jointly with Posidonia trace metal contents in order to quantify their bioaccumulation towards this primary producer, taking into account the seagrass biological cycle. (2) Portions of Posidonia meadow were also in situ experimentally contaminated with a mix of dissolved metals to study seagrass kinetics of pollutant accumulation and decontamination. Thanks to DGTs deployed inside contaminated mesocosms throughout experiments, Posidonia responses to known metal concentrations could be precisely quantified. (3) The blue mussel Mytilus galloprovincialis is widely used in trace metal monitoring programs. Mussels, stored in conchylicultural pouches, were transplanted for 3 months in contrasted stations of Calvi Bay (e.g. aquaculture farm, sewer, etc.) in parallel with DGTs. Such as for Posidonia, the complementary utilization of DGTs and mussels permitted to describe water contamination levels at the scale of the Bay, and their bioaccumulation towards mussels. These 3 studies demonstrate the usefulness of DGTs to monitor labile trace metals in an ecological and ecosystemic approach, in parallel with marine organisms, both indicators furnishing different and complementary informations about ecosystem functioning. [less ▲]

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See detailRegional scale flow and transport modelling for the management of groundwater and surface water bodies in the framework of the EU Water Directive
Leroy, Mathieu; Orban, Philippe ULg; Brouyère, Serge ULg et al

Conference (2011, May 02)

The Water Framework Directive requires from EU member states to manage water resources at the scale of surface water and groundwater bodies in a sustainable way, without altering the different functions ... [more ▼]

The Water Framework Directive requires from EU member states to manage water resources at the scale of surface water and groundwater bodies in a sustainable way, without altering the different functions provided by the system in natural conditions. Efficient management also requires qualitative tools to assess the evolution of water quality regarding the activities performed in the area of interest. In this context, the objective is to discuss the needs in terms of groundwater flow and transport modelling as a support to the Water Framework Directive and to present a methodological and numerical approach that fits with these requirements. Different variably-saturated models have been implemented for selected case studies ranging between 500 and 1700 km² in the Walloon Region of Belgium. The implementation of such models is challenging because of the scale and the processes that have to be simulated. However, when calibrated and used adequately, they are able to deliver most information required, such as the estimation and evolution with time of groundwater reserves, the calculation of different indicators on groundwater replenishment and exploitation, the base flow to rivers and surface water bodies, under different stress conditions such as pumping, rainfall and climate change. They are also used for the evaluation of regional groundwater quality status and for contaminant trend assessment (e.g. nitrate) under different alternative management scenarios and mitigation measures that could be implemented in the future. This study illustrates perfectly the efficiency and usefulness of regional scale groundwater flow and transport modelling as a tool for the management of groundwater bodies. [less ▲]

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See detailPercevoir sous la contrainte des phénomènes sensibles
Dewalque, Arnaud ULg

Conference (2011, May 02)

J'examine ici la contribution de Stumpf à l'analyse de la perception sensible, en particulier les concepts de "contenu partiel" et de "perception concomitante".

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See detailInterferon Response Factor 3 is essential for house dust mite-induced airway allergy
Marichal, Thomas ULg; Bedoret, Denis; Mesnil, Claire et al

Conference (2011, May)

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See detailLes Manuscrits de la ZER des Mille et une Nuits : quelques remarques codicologiques et philologiques
Franssen, Elise ULg

Conference (2011, May)

Les Mille et Une Nuits fascinent ; elles ont d’ailleurs généré de nombreuses études. Celles-ci se basent le plus souvent sur les éditions arabes du XIXe siècle, bien qu’aucune d’entre elles ne soit ... [more ▼]

Les Mille et Une Nuits fascinent ; elles ont d’ailleurs généré de nombreuses études. Celles-ci se basent le plus souvent sur les éditions arabes du XIXe siècle, bien qu’aucune d’entre elles ne soit réellement fiable. Depuis la classification des manuscrits des Nuits par Zotenberg, au XIXe siècle, la recherche dans ce domaine n’a pas progressé. L’un des groupes défini par Zotenberg rassemble les manuscrits, comprenant effectivement 1001 nuits, copiés en Égypte à la fin du XVIIIe ou au début du XIXe siècle. Ce groupe constitue mon corpus de thèse. Ces manuscrits ont été l’objet d’une analyse codicologique détaillée et les informations résultant de celle-ci sont confrontées aux résultats de l’étude littéraire du texte, dans une approche complète, matérielle et textuelle. Les Mille et Une Nuits furent écrites pour des bourgeois, dans leur langue, le moyen arabe, un niveau de langue encore peu connu. Mes recherches comprennent donc une analyse linguistiques des Nuits, centrée sur le conte de Ḥāsib Karīm ad-Dīn, dont je réalise l’édition critique et la traduction française. [less ▲]

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See detailDes savoirs pour devenir compétent
Schneider-Gilot, Marguerite ULg

Conference (2011, May)

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See detailÁrbol de luna y literatura de la migración latinoamericana actual: una hibridez irónica
Berlage, Pauline ULg

Conference (2011, May)

En esta comunicación, centro mi interés en una de las novelas que estudio en el marco de mi tesis de doctorado, se trata de la novela Árbol de luna del autor venezolano Juan Carlos Méndez Guédez (2000 ... [more ▼]

En esta comunicación, centro mi interés en una de las novelas que estudio en el marco de mi tesis de doctorado, se trata de la novela Árbol de luna del autor venezolano Juan Carlos Méndez Guédez (2000, Lengua de Trapo). Primero, situo esta obra dentro del panorama de la literatura de la migración latinoamericana actual explicando lo que entiendo por “literatura de la migración”. Presento, así, los problemas de tal etiqueta así como las posibilidades que abre. En la segunda parte, ilustrando mis argumentos con la novela de Méndez Guédez, vemos cómo, desde el punto de vista de la forma, el autor mezcla los géneros y los estilos de la novela picaresca, lo “real maravilloso”, el collage modernista etc. para formar un texto híbrido, entre realidad y mito. A través de mi intervención mi propósito es el de destacar el componente multicultural de esta tercera novela de J. C. Méndez Guédez así como el papel del lector que requiere la narrativa de la inmigración. [less ▲]

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See detailGas sensor array applied to the monitoring of biogas process
Adam, Gilles ULg; Lemaigre, Sébastien; Romain, Anne-Claude ULg et al

Conference (2011, May)

There is a lack of simple online monitoring system to control the performances of biogas reactors. The electronic nose technology appears to be an adapted device to deliver fast information about process ... [more ▼]

There is a lack of simple online monitoring system to control the performances of biogas reactors. The electronic nose technology appears to be an adapted device to deliver fast information about process disturbances in anaerobic reactors as it is adequate for online monitoring. In this study, twelve anaerobic mini-reactors were supervised with a home-made e-nose to observe process reaction in relation to organic overloads events. Usually, to avoid overload situations, on farms reactors are not fed at maximum load capacity, resulting in non optimized biogas production. The objective of the experiment was to determine if the gas sensors array feature can be related to the process state and if an indirect state variable, giving early warning of process faults, can be derived from the e-nose response. <br />The results demonstrated that focusing on gas phase of anaerobic reactors with a simple device composed of an array of non-specific gas sensors helped in the warning of disorders of the anaerobic digestion process. Mahalanobis distance from a cautious feeding group (group of observations indicating a good process) can be used as an indirect variable to evaluate the intensity of the state disorder. Euclidean distance has been also calculated but it was less informative than the Mahalanobis distance. [less ▲]

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See detailLa chimie verte
Richel, Aurore ULg

Conference (2011, May)

Le concept de « chimie verte » se décrit comme un ensemble cohérent de 12 principes ayant pour objectif de réduire ou d’éliminer l’ulitisation et la génération de substrances dangereuses émanant de la ... [more ▼]

Le concept de « chimie verte » se décrit comme un ensemble cohérent de 12 principes ayant pour objectif de réduire ou d’éliminer l’ulitisation et la génération de substrances dangereuses émanant de la synthèse et de l’application des produits chimiques. Parmi ces 12 principes, la réduction des déchets à la source, la diminution de l’utilisation des réactifs toxiques, la conservation de l’énergie et l’exploitation de matières premières renouvelables seront présentés et discutés sur base de quelques exemples choisis. [less ▲]

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See detailThe impact of financial disclosure on the information asymmetry and the liquidity of French listed companies
Ajina, Aymen ULg

Conference (2011, May)

This paper examines the relationship between the extent of financial disclosure, information asymmetry and stock-market liquidity in France. Based on a sample of 196 French listed firms over a period from ... [more ▼]

This paper examines the relationship between the extent of financial disclosure, information asymmetry and stock-market liquidity in France. Based on a sample of 196 French listed firms over a period from 2004 to 2007, we find that there is a positive and statistically significant relationship between the extent of information displayed through annual reports and market liquidity. This is explained by the negative effect of the disclosure on the adverse selection component of the bid-ask spread. This effect is confirmed by the commitment to IFRS by French-listed firms since 2005. This result should encourage French authorities to enhance their informational environment as a means to reduce information asymmetry and to prevent the risk of illiquidity. [less ▲]

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See detailThyroid endocrine disruption in situ and in vivo experiments reveals compensatory mechanisms
Schnitzler, Joseph ULg; Celis, Niko; Klaren, Peter et al

Conference (2011, May)

We compared effects of in situ and in vivo exposure of EDC on teleost thyroid system in order to get a complete picture of the putative interactions. A 120-day experimental exposure was designed in ... [more ▼]

We compared effects of in situ and in vivo exposure of EDC on teleost thyroid system in order to get a complete picture of the putative interactions. A 120-day experimental exposure was designed in combination to in situ measurements of persistent organic pollutants in 87 wild sea bass (Dicentrarchus labrax) form European estuaries. Seventy-five individuals were exposed to doses of PCB (0.3 to 1.0 µg Σ7PCBs per g food pellets) that reflects the persistent organic pollution to which the European sea bass population could conceivably be exposed. We applied a series of recommended measurement endpoints in these studies. The centrally controlled thyroidal secretion of T4 was monitored adequately from the muscular T4 levels and from thyroid histological appearance. Muscular T3 levels and enzymatic deiodinase and sulfatase activities in liver were measured. Observations made in experimental exposure to environmental relevant doses of PCB were consistent with those made in our field study. In both studies the muscular T4 levels were unaffected and no multivariate relationship with contaminant exposure could be revealed. Measurements of follicular diameter and epithelial cell heights showed no significant differences. Our findings revealed an increase of the hepatic T4ORD activity by higher chlorinated PCB congeners and DDTs. In both studies, we observed a general decrease the thyroid hormone conjugation by sulfatases that increases their solubility and facilitates their excretion. The muscular T3 levels were well preserved. These changes likely represent compensatory responses to disrupting effects that might otherwise have depressed T3 levels. This approach permitted us to interpret the causes and implications of alterations of the teleost thyroid system. [less ▲]

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See detailCoconut lumber for wood decks (Cocos nucifera L.):decay resistance against Basidiomycetes fungi
Jourez, Benoît ULg; Verheyen, Cécile; Van Acker, Joris

Conference (2011, May)

Since a couple of years, manufactured products of coconut wood for outdoor uses like wood decks have been proposed on the European market. These are presented as an alternative for traditional tropical ... [more ▼]

Since a couple of years, manufactured products of coconut wood for outdoor uses like wood decks have been proposed on the European market. These are presented as an alternative for traditional tropical timbers. In the past, coconut wood was neglected and burned for sanitary reasons and lack of interest at industrial scale. Plantation coconut trees at end of production of copra constitute a renewable resource with high added value. In order to convince the markets, natural durability for outdoor use, without preservative treatment, against wood destroying fungi characteristic of northern temperate regions is a major property that has to be checked. Natural durability of coconut lumber was tested in the laboratory according to the European standard EN 15083-1 against brown (Coniophora puteana) and white (Coriolus versicolor) rot decay basidiomycetes fungi. Beech wood specimens were used as virulence controls. Mass losses were determined after 16 weeks exposure. The results showed that tested coconut wood is very resistant to the brown rot fungus Coniophora puteana and resistant to the white rot fungus Coriolus versicolor. Mass loss and density of tested samples with C. versicolor are inversely related. In addition, the density shows a large variability in the test sample, more than 500 kg / m³. These results confirm that after a selection on density criteria, the natural durability of Coconut lumber is sufficient for outdoor application in use class 3 (based on European standard EN 335 and in line with EN 460). [less ▲]

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See detailL'art sonore et son exposition: un modèle d'hétérogénéité?
Eloy, Céline ULg

Conference (2011, May)

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See detailThe harbor seal and the harbor porpoise from the North Sea: review of their ecotoxicological status based on stranded and free-ranging individuals and potential threaths to the population
Das, Krishna ULg; Weijs, Liesbeth; Habran, Sarah ULg et al

Conference (2011, May)

The harbor seal (Phoca vitulina) and the harbor porpoise (Phocoena phocoena) from the North Sea have experienced major fluctuations these last decades due to habitat loss, prey fluctuation and pollution ... [more ▼]

The harbor seal (Phoca vitulina) and the harbor porpoise (Phocoena phocoena) from the North Sea have experienced major fluctuations these last decades due to habitat loss, prey fluctuation and pollution of the marine environment. Recently, development of monitoring programs and non-invasive sampling techniques, including seal catches in Germany allowed blood sampling together with measurements of blubber thickness, body mass, sex and body length. This approach is complementary to the study of stranded and by-caught individuals sampled during necropsies. Essential (Se, Zn, Cu, Fe) and non-essential elements (T-Hg, MeHg, Cd, Pb), perfluorinated organochemicals (PFCs) polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs) were measured in blubber and in blood (for selected compounds) of stranded, by-caught and free-ranging individuals from Belgian and German coasts. In contrast to Cd and Pb, hepatic T-Hg can reach concentrations as high as 2.1 μg.g-1 dry weight but depended on several factors including position in the trophic chain (inferred from δ13C and δ15N values), age group and the body mass. This level has been shown to generate in vitro toxicity on harbor seal lymphocytes. Organic compound analysis (PFCs, PCBs, PBDEs) revealed widespread dispersion of contaminants in the marine environment with higher concentrations in seals compared to porpoises in agreement with the higher trophic position of the harbor seal. However, metabolization of these compounds differed between the two species, as revealed by the higher contribution of the persistent BDE-47 and lower chlorinated and non-persistent congeners (e.g. CB 52, CB95) in tissues of harbor porpoises. T-Hg, PFCs, PCBs and PBDEs were detected in calves confirming maternal transfer to offspring. These pollutants are strongly suspected to affect the immune and endocrine systems as well as vitamin A metabolism and this raises concern about exposure-related health effects, especially in younger individuals. [less ▲]

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See detailThe leisure context, a forgotten topic of sport pedagogy?
Cloes, Marc ULg

Conference (2011, May)

According to the changes of the society that occurred during the last decades of the 20th century, new sport operators grew in an answer to the modified expectations of the people. In parallel to sport ... [more ▼]

According to the changes of the society that occurred during the last decades of the 20th century, new sport operators grew in an answer to the modified expectations of the people. In parallel to sport clubs, many other structures began to invite people to move in agreement with defferent values: independent non market associations, private compagnies, non organized free sport. While analyzing themes of Sport pedagogy research, it seems that physical education is the major focus (55.6%) of the papers presented in the ARIS's conferences while studies focused on coaching represented only 18.7%. On the other hand, researches that are analyzing the teaching-learning process in leisure sport are surprisingly seldom even there are more studies aiming to better understand how physical activity can be increased in communities, for example. After a shor description of the evolution of the sport structures and the development of the current array of operators, a second section focuses on the motives of participants. The next part underlines the specific ompetences of the physical educators involved in the leisure sport sector. The final and main part proposes an overview of some studies that has been achieved in this area at the University of Liege. The conclusion provides some recommendations for researchers. [less ▲]

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See detailModelling hte dynamics of oxygen in the Black Sea northwestern shelf
Capet, Arthur ULg; Beckers, Jean-Marie ULg; Joassin, Pascal et al

Conference (2011, May)

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See detailA Chlamydomonas mutant locked in anaerobiosis
Ghysels, Bart ULg; Matagne, René-Fernand ULg; Franck, Fabrice ULg

Conference (2011, May)

The soil dwelling microalga Chlamydomonas reinhardtii most likely encounters transient periods of anaerobiosis in its natural environment, for instance at night time or when photosynthesis is turned down ... [more ▼]

The soil dwelling microalga Chlamydomonas reinhardtii most likely encounters transient periods of anaerobiosis in its natural environment, for instance at night time or when photosynthesis is turned down in response to macronutrient limitation. Anoxic conditions trigger state I to state II transition in C.r. and the induction of a chloroplast hydrogenase., which ability to accept electrons from reduced Fd results in a transient light driven H2 evolution. We present evidence that hydrogenase induction and state transitions are required for the induction of photosynthesis in anaerobiosis and therefore critical for this alga in order to survive transient anaerobic periods in the dark. In an anaerobic metabolic context the induction of photosynthesis is severely slowed down. The highly reduced state of the NAD(P) pools and the absence of O2 as electron sink hamper light driven reoxydation of the intersystem electron carriers while CO2 assimilation by the Calvin cycle is inhibited by ATP deficiency. We have seen that gradual increase of hydrogenase activity during anaerobiosis restores a PSI acceptor pool and leads to a reduction of the induction lag of oxygenic photosynthesis. A mutant HydEF devoid of hydrogenase maturation genes typically shows 3 to 4 times longer lag phases that the WT. State transitions provide another mechanism by which photosynthetic electron transport can be unlocked in anaerobic conditions. A state II conformation is known to stimulate photo-phosphorylation, and may therefore restore Calvin cycle activity in an ATP depleted metabolic context. We observed that an anaerobically adapted stt7 mutant locked in state I is only able to induce oxygenic photosynthesis upon hydrogenase expression. We therefore constructed a double mutant Stt7HydEF impaired of state transition ability and hydrogenase activity and found it to have lost the capacity of inducing photosynthesis in anaerobic conditions. [less ▲]

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See detailLa responsabilité parentale - questions choisies
Pfeiff, Silvia ULg

Conference (2011, May)

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See detailFidélité et Substitution : Effets de l’Etendue et de la Durée des Ruptures de Stock sur le Comportement du Consommateur
Brandt, Céline ULg; Pahud de Mortanges, Charles ULg; Van Riel, Allard ULg

Conference (2011, May)

Our research presents three types of stock outs: the traditional stock out, the prolonged stock out and the brand prolonged stock out. The research question is as follows: « Is the consumer going to stay ... [more ▼]

Our research presents three types of stock outs: the traditional stock out, the prolonged stock out and the brand prolonged stock out. The research question is as follows: « Is the consumer going to stay loyal to the store by choosing a substitute or is he going to chose another retail store? » [less ▲]

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See detailFemmes, Finance et Responsabilités : quels sont les facteurs explicatifs de la faible représentation des femmes occupant un poste financier à responsabilités?
Grodent, Françoise ULg

Conference (2011, May)

Par cette communication, nous avons essayé d’identifier les raisons de la faible proportion des femmes occupant un poste à responsabilités, soit financier dans une organisation quelconque, soit au sein ... [more ▼]

Par cette communication, nous avons essayé d’identifier les raisons de la faible proportion des femmes occupant un poste à responsabilités, soit financier dans une organisation quelconque, soit au sein même d’une institution financière, en nous basant principalement sur le genre et sur l’ensemble des préjugés qui y sont associés. [less ▲]

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See detailLe formulaire thérapeutique : Mythes et réalités
Van Hees, Thierry ULg

Conference (2011, May)

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See detailGC-MS for metabolomic profiling
Focant, Jean-François ULg

Conference (2011, May)

Detailed reference viewed: 14 (1 ULg)
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See detailThe link between psychosocial load at work and occupational injuries in Belgium.
Marzucco, Laurence ULg; Van Risseghem, Marleen; Braeckman, Lutgart et al

Conference (2011, May)

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See detailAircraft Cargo AutoLoad
Schyns, Michael ULg; Limbourg, Sabine ULg

Conference (2011, May)

Detailed reference viewed: 35 (5 ULg)
See detailImpact of climate and carbon sensitivities on the North Pacific ventilation in an Earth system model
Mouchet, Anne ULg; Menviel, Laurie; Goosse, Hugues et al

Conference (2011, May)

Detailed reference viewed: 9 (1 ULg)
See detailImages de la Lotharingie dans les revendications territoriales belges à l'égard de l'Allemagne après 1945
Brüll, Christoph ULg

Conference (2011, April 29)

Le « mythe médian », le rêve d’un espace d’entre-deux – le plus souvent par référence à l’imaginaire de la Lotharingie médiévale – a souvent occupé les esprits des nationalistes expansionnistes belges ... [more ▼]

Le « mythe médian », le rêve d’un espace d’entre-deux – le plus souvent par référence à l’imaginaire de la Lotharingie médiévale – a souvent occupé les esprits des nationalistes expansionnistes belges après la Première et la Seconde Guerre mondiale. A travers les exemples de Pierre Nothomb et de quelques autres protagonistes du « Comité Belge du Rhin », la communication analyse les revendications d’une annexion de territoires rhénans à la Belgique après 1945 et de la création d’un Etat rhénan. En outre, elle présente les tentatives de certains acteurs allemands de transformer le « mythe médian » hégémonique en une voie de réconciliation avec les voisins occidentaux de la jeune RFA. En dernier lieu, l’exposé montre comment les nationalistes belges ont récupéré cette conception à partir du milieu des années 1950, ce qui les amène à abandonner leur discours annexionniste au profit d’un discours de rapprochement régional européen. [less ▲]

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See detailSamenwerken met behandelend arts, arbeidgeneesheer en adviserend geneesheer
Mairiaux, Philippe ULg

Conference (2011, April 29)

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See detailDistribution of temperature in steel and composite beams and joints under natural fire
Hanus, François; Franssen, Jean-Marc ULg

Conference (2011, April 29)

Parametric numerical analyses have been performed with SAFIR for the temperature distribution in steel and composite beams and joints subjected to natural fires. A simple model has been derived to ... [more ▼]

Parametric numerical analyses have been performed with SAFIR for the temperature distribution in steel and composite beams and joints subjected to natural fires. A simple model has been derived to calculate the temperature development in the upper flange of the steel section supporting a concrete slab. This model takes into account, not only the heat transfer with the surounding hot gases, but also the heat transfer 1) by conduction with the lower part of the section through the web and 2) with the supported concrete slab. [less ▲]

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See detailValidation and Routine of Ligand-Binding Assays, a Bayesian Perspective
Lebrun, Pierre ULg; Boulanger, Bruno; Hubert, Philippe ULg

Conference (2011, April 29)

The way to apply Bayesian modeling is illustrated to validate a ligand-binding assay such as ELISA. Hierarchical non-linear model and the associated predictive distribution of back-calculated responses ... [more ▼]

The way to apply Bayesian modeling is illustrated to validate a ligand-binding assay such as ELISA. Hierarchical non-linear model and the associated predictive distribution of back-calculated responses allow quantifying the total uncertainty of every future measurement with the assays, through the use of precision and risk profiles. It is also shown how the obtained posterior distribution of the parameters can be used as prior for new the calibration curves during routine. [less ▲]

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See detailStimuli-responsive triblock copolymer for biomedical applications
Sibret, Pierre ULg; Jérôme, Christine ULg

Conference (2011, April 29)

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See detailA single synthetic molecular machine that generates force against a load
Lussis, Perrine ULg; Svaldo-lanero, Tiziana; Bertocco, Andrea et al

Conference (2011, April 29)

Biological molecular machines are able to rectify random thermal motions to generate directional force and carry out tasks on both the molecular and macroscopic length scales1. Although some artificial ... [more ▼]

Biological molecular machines are able to rectify random thermal motions to generate directional force and carry out tasks on both the molecular and macroscopic length scales1. Although some artificial nanomachines have been synthesized2-4 and used to collectively carry out mechanical tasks5-8, the direct measurement of the mechanical processes at the single molecule level has yet to be realized. We show that biased Brownian motion of the sub-molecular components in a hydrogen bonded [2]rotaxane9-a molecular ring threaded onto a molecular axle-can be harnessed to generate significant directional forces. We applied a mechanical load to the ring by atomic force microscopy (AFM) cantilever during single molecule pulling-relaxing cycle. Using fluctuation theorems, we were able to relate the measurements of the work done at the level of individual molecules to the free energy change measured previously by ensemble measurements. The results show that individual rotaxane molecules can generate directional forces of similar magnitude to biological machines, and extend the capabilities of AFM-based single molecule mechanics to the world of small molecules. 1. Schilva, M. (ed.) Molecular Motors (Wiley-VCH, Weinheim, 2003). 2. Kinbara, K. & Aida, T. Toward intelligent molecular machines : Directed motions of biological and artificial molecules and assemblies. Chem. Rev. 105, 1377-1400 (2005). 3. Kay, E. R., Liegh, D. A. & Zerbetto, F. Synthetic molecular motors and mechanical machines. Angew. Chem. Int. Ed. 46, 72-191 (2007). 4. Browne, W., Feringa, B. L. Making molecular machines work. Nature Nanotech. 1, 25-35 (2006). 5. Berna, J., Leigh, D. A., Lubomska, M., Mendoza, S. M., Pérez, E. M., Rudolf, P., Teobaldi, G. & Zerbetto, F. Macroscopic transport by synthetic molecular machines. Nature Mater. 4, 704-710 (2005). 6. Liu, Y., Flood, A. H., Bonvallet, P. A., Vignon, S. A., Northrop, B. H., Tseng, H.-R., Jeppesen, J. O., Huang, T. J., Brough, B., Baller, M., Magonov, S., Solares, S. D., Goddard, W. A., Ho, C.-M. & Stoddart, J. F. Linear artificial molecular muscles. J. Am. Chem. Soc. 127, 9745-9759 (2005) 7. Eelkema, R., Pollard, M. M., Vicario, J., Katsonis, N., Ramon, B. S., Bastiaansen, C. W. M., Broer, D. J. & Feringa, B. L. Molecular machines: Nanomotor rotates microscale objects. Nature 440, 163 (2006). 8. Muraoka, T., Kinbara, K., Aida, T. Mechanical twisting of a guest by a photoresponsive host. Nature 440, 512-515 (2006). 9. Kay, E. R. & Liegh, D. A. Hydrogen bond-assembled synthetic molecular motors and machines. Top. Curr. Chem. 262, 133-177 (2005). [less ▲]

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See detailDisulfide bonds assignment and folding characterization of peptide toxins by Ion Mobility Mass Spectrometry
Echterbille, Julien ULg; Quinton, Loïc ULg; De Pauw, Edwin ULg et al

Conference (2011, April 29)

Main component of animal venoms is peptide toxins, which are highly structured by several disulfide bridges. Disulfide bridges fill different roles as increasing the toxins efficiency by lowering their ... [more ▼]

Main component of animal venoms is peptide toxins, which are highly structured by several disulfide bridges. Disulfide bridges fill different roles as increasing the toxins efficiency by lowering their immunogenicity or providing the adequate conformation to efficiently bind to the biological receptor. The sequencing and the determination of the cysteine pairing is still challenging and therefore an important step in structural analysis. In this work, we present a new strategy to sequence structured toxins and assign S-S bridges using ion mobility resolved MS/MS. The method relies on the analysis of partially reduced multiple-disulfide peptide. The mixture of the different forms is resolved by ion mobility, followed by MS/MS acquisition on each mobility separated species. The proof of concept has been successfully conducted on α-CnI, a toxin purified from the venom of Conus consors marine snail. The toxin’s sequence contains four cysteines linked together with two disulfide bridges. α-CnI was partially reduced by a small excess of tris(carboxyethyl)phosphine (10:1). The resulting mixture was purified before analysis by infusion nanoESI-Synapt-G2. Fragmentation was performed after the mobility cell, to obtain specific fragments of each species. Partial reduction of α-CnI results in a mixture of oxidized (the two disulfides are formed), reduced (the two disulfides have been reduced) and partially reduced forms (one of the two disulfides has been reduced). The arrival time distribution of triply charged ions reveals the presence of 4 different species, characterized by different relative cross sections in the gas-phase. Mass matching allows identifying the species: the first mobility (the most compact structure) was identified to be the oxidized folded toxin (M). The latest peak, corresponding to the larger cross-section, was identified as the fully reduced toxin (M+4Da). The second and the third mobility peaks were attributed to the two partially reduced forms in which only one disulfide bridge was reduced (M+2Da). The change in ion mobility depends on which S-S bridge is reduced. Ion mobility separated species give characteristic fragment ions upon fragmentation in the transfer cell (i.e. after ion mobility separator). Interestingly, fragment ions coming from partially reduced species, especially the C-S or S-S bond cleavages, clearly indicates that the disulfide linkage of α-CnI is (Cys1-Cys3) and (Cys2-Cys4) as expected from literature. The method is now being applied with success to more complex systems containing 3 or 4 disulfide bridges. The influence of the charge state on the mobility separation is systematically analyzed in terms of structural implications. [less ▲]

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See detailLa frontière: concepts et historiographie (Introduction)
Close, Florence ULg; Lanneau, Catherine ULg

Conference (2011, April 29)

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See detailLe Rhin des Césars. Frontière d'empire et source de pouvoir
Dignef, Anthony ULg

Conference (2011, April 29)

Les frontières de l’empire romain, et la frontière du Rhin en particulier, ont retenu l’attention de nombreux historiens et archéologues. Cette communication revient sur les débats, parfois vifs, à propos ... [more ▼]

Les frontières de l’empire romain, et la frontière du Rhin en particulier, ont retenu l’attention de nombreux historiens et archéologues. Cette communication revient sur les débats, parfois vifs, à propos du limes et montre que l’étude des fortifications militaires ne doit pas être négligée, mais s’inscrire dans une analyse plus large de la culture politique romaine. Dans un second temps, la lecture socio-économique des rapports entre les Romains et les Barbares, proposée par Charles Richard Whittaker, est revue et complétée à la lumière des travaux plus récents de Michael Erdrich, Peter S. Wells et Marjan C. Galestin. La dernière partie de l’exposé, consacrée à la question de l’ethnogenèse s’appuie sur les recherches de Brian Ferguson et de Neil Whitehead pour montrer le rôle déterminant de la frontière dans le processus de (trans)formation des « peuples barbares ». [less ▲]

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See detailThe Nutshells of Fiction: Formal Remanence in the Works of Janet Frame
Delrez, Marc ULg

Conference (2011, April 28)

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See detailAnalyse Morpho-constitutionnelle des lithiases & Cristallurie, en pratique
GADISSEUR, Romy ULg

Conference (2011, April 28)

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See detailPrésentation du projet de Spin-off IMONIC
Goffin, Dorothée ULg

Conference (2011, April 28)

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See detailTraitement du Diabète et passage à l'insuline
RADERMECKER, Régis ULg

Conference (2011, April 28)

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See detailImpact of liquidity constraint on the management of animal genetic resources by pastoralist herders.
Antoine-Moussiaux, Nicolas ULg

Conference (2011, April 27)

The improvement of pastoral livelihoods in the context of a highly uncertain economic and climatic future implies a double need for conserving livestock biodiversity and reaching productivity gains. In ... [more ▼]

The improvement of pastoral livelihoods in the context of a highly uncertain economic and climatic future implies a double need for conserving livestock biodiversity and reaching productivity gains. In situ conservation through participative genetic improvement programs is a tool of choice for these sustainable development pursuits. In this regard, selection criteria chosen by pastoralist breeders can be classified in two broad categories : productivity-seeking or risk-alleviating. The latter aim was an important motive for the constitution of the present indigenous breeds while the former is often a rationale for their neglect. Understanding the balance can help finding the way to sustainable biodiversity management. As the basis of pastoral livelihood systems, livestock shoulders many roles, among which that of savings may be considered central. Credit facilities lacking in these remote areas, breeders would thus sell part of their productive capital to invest in its improvement. The present model consists in a theoretical inquiry for the possible consequence of this polyvalence of livestock, productive capital and mobilizable saving, on the choice between the two above-mentioned breeding aims under liquidity constraint. A major outcome of the proposed model is the existence of a threshold herd size effect on investment in risk-control. This effect does not bear on investment in productivity and is no longer observed if credit constraint is relaxed. This threshold is thus proposed to entail the presence of an “erosion trap” for biodiversity and further recalls the difficulty to design a breeding program for a group of breeders with very diverse endowments. As a result, appropriate credit programs should be considered as an important key to adoption of breeding schemes for in situ conservation, and thus both their efficiency and viability. [less ▲]

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See detailEx vivo ruminal cellulosome for by-product biomass conversion
Hissette, Mathias ULg; Destain, Jacqueline ULg; Thewis, André ULg et al

Conference (2011, April 27)

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See detailLes conséquences de la connaissance du génocide des Juifs sur le vivre-ensemble
Grandjean, Geoffrey ULg

Conference (2011, April 21)

La transmission de la mémoire de faits passés suscite d’épineuses questions dans nos sociétés contemporaines. À travers ces questions, c’est la thématique du vivre-ensemble qui est interrogée puisque la ... [more ▼]

La transmission de la mémoire de faits passés suscite d’épineuses questions dans nos sociétés contemporaines. À travers ces questions, c’est la thématique du vivre-ensemble qui est interrogée puisque la mémoire de ces faits est une reconstruction du passé. Les faits génocidaires n’échappent pas à la règle et la mémoire de ceux-ci est particulièrement importante dans nos sociétés européennes contemporaines. Afin d’éclairer les enjeux découlant de cette transmission sur le vivre-ensemble, nous voudrions axer notre propos sur une dimension précise, à savoir la conscientisation politique découlant de la transmission de la mémoire des faits génocidaires. Ainsi, les recherches que nous menons ont pour but d’analyser la manière dont cette transmission peut participer à l’intégration de jeunes Belges âgés de seize à dix-huit ans dans un système politique caractérisé par un régime démocratique. Autrement dit, il s’agit de savoir comment ces jeunes appréhendent, suite à la transmission de la mémoire des faits génocidaires, leur position dans un régime démocratique placé sous une autorité politique produisant des règles s’imposant à l’ensemble des membres de la société. Afin de répondre à cette question, différentes hypothèses ont été élaborées. Elles concernent les acquis cognitifs de type politique, les potentielles volontés d’engagement politique et civique, les images des autorités politiques, les attitudes politiques partisanes et l’efficacité politique de ces jeunes. Afin de confirmer ou non ces hypothèses, un dispositif de recherches précis a été mis en place. Il a consisté à réaliser des focus groups longitudinaux avec les jeunes visés. Au total, vingt-deux focus groups ont été réalisés en deux vagues successives séparées par un intervalle de temps compris entre douze et vingt mois. Différentes variables ont été prises en compte pour la constitution des groupes (population immigrée ou non, population issue d’un milieu favorisé ou non, population issue d’un milieu rural ou urbain et population issue du réseau officiel ou du réseau libre). Le protocole de recherche était rigoureusement identique afin de pouvoir réaliser les comparaisons adéquates. L’ensemble du corpus de données a fait l’objet d’une analyse qualitative avec l’appui d’un logiciel d’analyse qualitative. Les résultats présentés permettront ainsi d’éclairer les enjeux découlant de la transmission de la mémoire des faits génocidaires dans une société démocratique. [less ▲]

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See detailLes communes wallonnes et la gouvernance. Celui à qui on rend compte, est-il gouverné ou gouverne-t-il ?
Verjans, Pierre ULg; Matagne, Geoffroy ULg; Radoux, Emmanuel ULg

Conference (2011, April 21)

Les réformes du code de la démocratie locale et de la décentralisation reproduisent en Wallonie l'idéologie de la gouvernance issue de l'Union européenne après avoir été traduite par la Banque mondiale du ... [more ▼]

Les réformes du code de la démocratie locale et de la décentralisation reproduisent en Wallonie l'idéologie de la gouvernance issue de l'Union européenne après avoir été traduite par la Banque mondiale du monde de l'entreprise privée. On trouve dans les modifications de fonctionnement des collèges communaux les traces des exigence d'ouverture, participation et responsabilité d'un côté et d'efficacité et de cohérence de l'autre, appliquées à la nomination des bourgmestres et de l'application de la motion de méfiance constructive. [less ▲]

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See detailLe territoire politico-religieux de la RDC face à la politisation des pasteurs de la diaspora
Demart, Sarah ULg

Conference (2011, April 21)

En novembre 2011 auront lieu les prochaines élections présidentielles en République démocratique du Congo (RDC). Pour la première fois dans l’histoire du pays, le mode de scrutin présidentiel sera à un ... [more ▼]

En novembre 2011 auront lieu les prochaines élections présidentielles en République démocratique du Congo (RDC). Pour la première fois dans l’histoire du pays, le mode de scrutin présidentiel sera à un seul tour. La raison invoquée par les autorités, l’Assemblée nationale et le Sénat qui votèrent cet article: rompre avec la tutelle internationale. Cependant, pour l’ « opposition », cette révision constitutionnelle vise surtout à renforcer le pouvoir du chef de l’État, candidat à sa propre succession. Dans le cadre de cette communication, nous voudrions examiner la plurilocalisation du débat politique congolais en lien avec la grille de lecture politico-religieuse qui quadrilla les Présidentielles de 2006. L’origine supposée rwandaise du chef de l’Etat congolais fut, en effet, non seulement le thème majeur de cette campagne mais un extraordinaire agent de fédération, idéologique, de l’« opposition ». S’il est aujourd’hui peu probable que la force de cette accusation suffise à rallier l’ « opposition », désormais contrainte de faire politiquement alliance, sa mise à jour pourrait par contre éclairer la réorganisation du champ politique à venir. Non seulement parce que ce soupçon accusateur a réitéré les logiques d’influence réciproque entre politique et religieux, du Réveil, mais parce qu’il souligne les formes de continuité entre différentes transitions politiques, en lien avec les logiques de conversion et de reconversion des acteurs politico-religieux. [less ▲]

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See detailThe electoral threshold in the Belgian regional elections: the best way to fight fragmentation?
Onclin, François ULg; Reuchamps, Min ULg

Conference (2011, April 21)

In many proportional representation (PR) systems, a legal electoral threshold has been implemented. Such a threshold reserves the allocation of seats to those parties which reach a minimum number of votes ... [more ▼]

In many proportional representation (PR) systems, a legal electoral threshold has been implemented. Such a threshold reserves the allocation of seats to those parties which reach a minimum number of votes or a percentage of the votes. Since 2004, a legal threshold of five per cent has been introduced for the Belgian regional elections, following the introduction two years earlier of the same mechanism for the federal elections. The main reason behind this electoral reform – in a country which has been quite stable on this regard – was to prevent the further fragmentation of the political spectrum. This paper aims at testing this claim on empirical grounds. Two regional elections – 2004 and 2009 – can be surveyed in order to measure the effects of the electoral threshold. It is particularly relevant to study the impact of the electoral threshold in the regional elections because there are several discrepancies between the Regions in terms of the size of the districts, the fragmentation of the party system and the electorates. These differences may indeed influence the potential effects of the legal threshold. Since Duverger’s seminal work, electoral rules are known to influence the party system through their impact on the electoral outcomes, on the one hand, and on the electoral behaviour of both parties and voters, on the other hand. Two effects, which have been much further developed by the subsequent literature and are now widely accepted, are at stake here: the mechanical and the psychological. While the former refers to the objective mechanism of under-representation of some – usually the smaller – parties which may potentially lead to their disappearance because of the electoral laws, the latter implies the more subjective mechanism which can play at the level of both voters and party elites. Thus, in order to measure the impact of the legal five per cent threshold on the fragmentation, this paper tests the mechanical and the psychological effects for the Belgian regional elections of 2004 and 2009. [less ▲]

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See detailBeing Moroccan abroad. Objects and everyday practices in women subjectivation.
Mescoli, Elsa ULg

Conference (2011, April 18)

Objects and practices used and performed daily, play a central role in the definition of the self, and migration paths, meant both in a personal and in a collective sense, determine complex dynamics which ... [more ▼]

Objects and practices used and performed daily, play a central role in the definition of the self, and migration paths, meant both in a personal and in a collective sense, determine complex dynamics which involve them directly. Starting from De Certeau's analysis of everyday life [1980], my research focuses on Moroccan women living in Milan's suburbs, and it aims at studying how they make themselves and the place where they live, after migration, through materiality, moving in peculiar ways among what new local context (with its mass production and wished standardization of habits) and origin country (where what is perceived as "traditional" constantly meets the global dimension of goods and practices) impose. The murmuring of everyday practices and the words of the objects involved talk about women who perform and use them in ways that lead a complex reflection on the definition of a proper Moroccan "style" [Gell, 1998]: if we can say that a person is made of material objects which determine an induction of its own agency, of biographical history and of collective memory, equally we might state that these objects interlace among each other and define different manners of being Moroccan, and of being it abroad. [less ▲]

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See detailIdentities and Federal Dynamics in Multinational Societies: comparisons within and between Belgium and Canada
Reuchamps, Min ULg

Conference (2011, April 15)

Identities matter and this is especially true in multinational societies. In such societies, political identities play a chief variable in the political dynamics of the country. Identities ... [more ▼]

Identities matter and this is especially true in multinational societies. In such societies, political identities play a chief variable in the political dynamics of the country. Identities receivetherefore much attention in most studies on this topic. In this perspective, communities are often seen as monolithic blocks at war with each other, along ethnic-linguistic lines. However, there is a missing link between identities and federal dynamics: it should be explored how identities shape the federal dynamics and how the federal dynamics shape identities. In Belgium and Canada, two multinational federations, the federal dynamics is much influenced by abipolar dynamics between the two main ethno-linguistic groups, which may stir fruitful comparisons and insight for the understanding of multinational federations. In both countries, identities and federal dynamics are intrinsically related to each other. Yet, their current political situation is quite different. While Belgium is stuck in a deep institutional crisis, Canada has now entered a period of – more or less – stability; even though the potential for tensions has not disappeared. The different path may be explained by the interactions between identities and federal dynamics within and between the two main linguistic groups. To explore these interactions, four citizens panels were organised in Montréal (Quebec), Kingston (Ontario), Liège (French-speaking Belgium) and Antwerp (Dutch-speaking Belgium). Each panel gathered 20-30 citizens for a half-day group discussion and thus provides insightful qualitative data. More specifically, different “identity triangles” – the identities of citizens in terms of “me”, “us”, and “them” – come out this original research and these triangles illuminate different perceptions and preferences for the future of their country. The results show the identity triangles within Canada are more dissimilar than within Belgium. It also reveals the proximity of some profiles between the two countries. Although a quantitative research would be needed to offer a greater leverage in terms of generalisations, such a qualitative study offer a deeper look into the identity and federal politics, which illuminate the dynamics at the heart of most multinational federations. [less ▲]

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See detailWhat do protect the prevention policies in 20th century western coal industries ?
Geerkens, Eric ULg

Conference (2011, April 15)

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See detailThe Future of Belgium
Reuchamps, Min ULg

Conference (2011, April 14)

Issues for discussion: 1) Two peoples claiming the same real estate? A Brussels which is 90% Francophone and cradle of the Flemish cultural heritage. The ‘droit du sol’ vs ‘droit des gens’. 2) A conflict ... [more ▼]

Issues for discussion: 1) Two peoples claiming the same real estate? A Brussels which is 90% Francophone and cradle of the Flemish cultural heritage. The ‘droit du sol’ vs ‘droit des gens’. 2) A conflict between linguistic communities? or a cultural divide between Neo-liberal Anglo-Saxon culture in the North and Continental dirigisme in the South? 3) Has Romantic nationalism of the Flemish separatist movement truly been supplanted by ‘Nationalists with Calculators’? 4) The position of the monarchy and the traditional elites in the growing social and political crisis. 5) The EU as unwitting facilitator of the Continent’s cascading self-determinations: the alignment of Bart de Wever’s most populous party in Flanders with an EU identity [less ▲]

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See detailDonner un sens aux données: Le cas de la modélisation de l'information archéologique du site de calakmul (Mexico)
Van Ruymbeke, Muriel ULg; Cervera - Xicotencatl, Ari; Billen, Roland ULg et al

Conference (2011, April 13)

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See detailBreeding sites of Bluetongue virus vectors in Belgian cowshed
Zimmer, Jean-Yves ULg; Saegerman, Claude ULg; Losson, Bertrand ULg et al

Conference (2011, April 13)

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See detailStudying debris disks with near‐infrared interferometry
Absil, Olivier ULg; Augereau, J.-C.; Le Bouquin, J.-B. et al

Conference (2011, April 13)

In this talk, I will describe and illustrate two different ways in which near-infrared stellar interferometry can be used to constrain the nature and physics of debris disks, and help understand the ... [more ▼]

In this talk, I will describe and illustrate two different ways in which near-infrared stellar interferometry can be used to constrain the nature and physics of debris disks, and help understand the global architecture of planetary systems in general. In the first part of the talk, I will review the on-going efforts to detect bright exozodiacal disks with precision near-infrared interferometry. I will describe the results of the exozodi survey that we are currently carrying out at the CHARA array, and briefly discuss our first results and perspectives with the new PIONIER instrument at the VLTI (including the identification of previously unknown low-mass companions). Preliminary statistical trends on the occurrence of bright exozodi around nearby main sequence stars will be presented, and I will discuss how this information could be used to constrain the global architecture and evolution of debris disks. In the second part of the talk, I will focus on our on-going project to characterize the “spin-orbit” alignment of resolved debris disks with the rotation axis of their (rapidly rotating) host star. Our first result obtained with the VLTI/AMBER spectro-interferometer on Fomalhaut will be presented, as well as its possible consequences on the dynamics of the planetary system and on the physics of the grains composing the Fomalhaut dust ring. I will then briefly describe the status and perspectives of this project. [less ▲]

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See detailRecent Advances in Macromolecular Design via Cobalt-Mediated Radical Polymerization
Debuigne, Antoine ULg; Hurtgen, Marie ULg; Piette, Yasmine ULg et al

Conference (2011, April 13)

This communication will focuse on recent progress in the field of cobalt-mediated radical polymerization (CMRP). For example, the beneficial impact of cobalt complexes on the course of acrylate and vinyl ... [more ▼]

This communication will focuse on recent progress in the field of cobalt-mediated radical polymerization (CMRP). For example, the beneficial impact of cobalt complexes on the course of acrylate and vinyl chloride (VC) polymerizations will be discussed. The addition of conjugated unsaturated derivatives, like dienes, fullerenes and carbon nanotubes, onto (co)polymers preformed by CMRP has also been investigated. Similarities and differences between these radical addition processes will be presented as well as the potential applications of the resulting copolymers and carbon based materials for photodynamic therapy (PDT) and electromagnetic interferences (EMI) shielding. [less ▲]

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See detailSur l'équation fonctionnelle de Cauchy généralisée
Kreit, Damien ULg

Conference (2011, April 13)

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See detailCaractérisation et vieillissement accéléré de pigments de bleu de Prusse synthétisés selon les méthodes de préparation anciennes et modernes
Samain, Louise ULg; Lauricella, Melina; Silversmit, Geert et al

Conference (2011, April 11)

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See detailImproved automatic calibration of groundwater flow models using self-potential measurements
Robert, Tanguy ULg; Therrien, René; Lemieux, Jean-Michel et al

Conference (2011, April 11)

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See detailL'utilisation du fer dans la construction médiévale mosane : explications et premiers repères d'une évolution
Maggi, Christophe ULg; Pagès, Gaspard ULg; Hoffsummer, Patrick ULg et al

Conference (2011, April 11)

The development of a new comparative approach establishing a link between the evaluation of the quantity of barks used in a roof frame and the volume of wood present in this same attic allows the ... [more ▼]

The development of a new comparative approach establishing a link between the evaluation of the quantity of barks used in a roof frame and the volume of wood present in this same attic allows the acquisition of essential information for the apprehension of the economical, the technical and the social contexts in which a timber frame was drawn up. By carrying out this kind of comparison in a systematic way in about thirty attics of religious buildings dispersed in the Walloon region (Belgium), the evolution of these contexts develops step by step since 12th until 18thcentury and highlights phenomena which influence the methods of constructions of the carpenters, like the appearance of the saw or the rarefaction of the forest resources. The confrontation of this result with the evolution of the volume of iron considered in the attics reveals the catch of importance of this material in function of the time and of the architectural principles. Iron appears in the roof frames of our areas in the same time that the advent of the Gothic architecture in link with the increase of the roof’s dimensions. Its employment generalizes then knows a real expansion at the 17th century because of the rarefaction of the forest resources but also because the preindustrial techniques allow it. [less ▲]

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See detailEvaluation of the present and future general circulation over western Europe simulated by the IPCC AR5/CMIP5 GCMs with the help of a circulation type classification
Belleflamme, Alexandre ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg

Conference (2011, April 08)

Downscaling methods forced by General Circulation Model (GCM) simulations are not able to correct the biases in the general circulation simulated by the GCMs. Moreover, since the GCMs have a coarse ... [more ▼]

Downscaling methods forced by General Circulation Model (GCM) simulations are not able to correct the biases in the general circulation simulated by the GCMs. Moreover, since the GCMs have a coarse spatial resolution, they have difficulties to simulate reliably ground variables like temperature and precipitation which are affected by topography, land use and local features. So, we can attempt that they simulate better the large-scale atmospheric circulation. That is why it is of special interest to evaluate the GCM simulations of atmospheric circulation for current climate by comparing them with the NCEP-NCAR 1 and the ECMWF reanalysis data over 1961-1990. This analysis is done over western Europe for summer (JJA) and winter (DJF) for the GCMs (available on http://cmippcmdi.llnl.gov/cmip5/) proposed by the IPCC for its upcoming report (AR5). The method used is an automated circulation type classification based on the daily geopotential height at 500 hPa. It is a leader-algorithm correlation based method taking part of the COST733CAT classification catalogue. Unlike the usually used methods based on the monthly mean circulation, this approach allows a precise analysis of each circulation type. So, it gives much more information on the ability of the GCMs to simulate the different circulation types and consequently the climatic variability of a region. In order to allow a direct comparison between the GCM simulations and the reanalysis data, the classification is done first only for the reanalysis dataset over 1961-1990. Then, the main types individualised here are imposed for the classification of the GCM outputs. Since the circulation types are the same, the comparison between the datasets can be made on the basis of the differences of the frequency distribution throughout the classes. Moreover, the mean intraclass repartition of the circulation situations may differ from one dataset to another. So, the study of this mean and its standard deviation gives an idea of the differences between the reanalysis and the GCMs within each class. Firstly, this approach is applied to current climate (1961-1990) for evaluating the ability of the GCMs driven by the historical experiment to simulate the climate of the last decades over western Europe. In fact, if one GCM is not able to reproduce reliably the main characteristics of the current climate, its future projections may be questionable. Then, the best matching GCMs are retained and the same approach is applied to the future simulations driven by RCP concentrations or emissions (2011-2040, 2041-2070 and 2071-2100). So, the evolution of the frequency of the circulation types and maybe the appearance of new types can be analysed under climate change conditions. Moreover, it is interesting to compare the uncertainty of the current climate simulations to the projected changes for future climate. If the uncertainty is of the same order or higher than the projected changes, the reliability of the simulations for future climate may be very questionable. [less ▲]

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See detailEvaluation of sinks and sources of CO2 in the global coastal ocean using a spatially-explicit typology of estuaries and continental shelves
Laruelle, G. G.; Dürr, H. H.; Slomp, C. P. et al

Conference (2011, April 08)

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See detailCLUPI: the High-Performance Close-up Camera System on board the 2018 ExoMars Rover
Josset, J. L.; Westall, F.; Hofmann, B. A. et al

Conference (2011, April 08)

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See detailMusique, Communication, Mediation. Aspects communicationnels de la pratique musicale : retour réflexif
Lambeau, Céline ULg

Conference (2011, April 08)

Musique, Communication, Médiation La présentation questionne la possibilité de fonder conceptuellement le syntagme « communication musicale », et propose d’étudier la dimension communicationnelle de la ... [more ▼]

Musique, Communication, Médiation La présentation questionne la possibilité de fonder conceptuellement le syntagme « communication musicale », et propose d’étudier la dimension communicationnelle de la pratique musicale collective, en recourant à la notion de « médiation » en tant qu’elle constitue un modèle nouveau permettant d’appréhender les phénomènes de communication impliquant un « tiers » (ici le matériau musical). Ainsi que l’a décrit Jean Davallon : « La notion de médiation apparaît chaque fois qu’il y a besoin de décrire une action impliquant une transformation de la situation et du dispositif communicationnel, et non une simple interaction entre éléments, et encore moins une circulation d’un élément d’un pôle à un autre. (…) Avec ce recours, l’origine de l’action se déplace de l’actant destinateur ou des interactants vers un actant tiers : il y a communication par l’opération du tiers » (Davallon-MEI, 2003, 43). La communication revient en particulier sur la façon dont « la musique », objet du monde appréhendé de manière holistique au début de ma recherche doctorale, a été progressivement saisie dans les différentes « natures » que lui attribue le champ scientifique (notion, pratique sociale, …) , et comment cette redéfinition a permis d'appréhender la « musique » comme un ensemble de pratiques et de représentations, constituant un terrain pour une étude portant sur les dispositifs de médiation, entendu au sens de (Servais 2010) comme "un bon outil pour penser l'impensé des pratiques de communication"(. [less ▲]

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See detailLe confort du piéton dans l'espace public
Reiter, Sigrid ULg

Conference (2011, April 08)

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See detailCombating Child Labour in Burkina Faso: Are the public policies dealing with the impossible?
Wouango, Joséphine ULg

Conference (2011, April 07)

These last years, the objective of abolishing child labour in Burkina Faso (a West African country) has tried to create a national unanimity regarding the commitment of collective actors (decision-makers ... [more ▼]

These last years, the objective of abolishing child labour in Burkina Faso (a West African country) has tried to create a national unanimity regarding the commitment of collective actors (decision-makers, civil society, employers, labor unions and media). It started by integrating the National Program of child welfare and the schedule of the Ministry of Employment, Ministry of Social Action, and the Ministry of Education. Burkina Faso joined the International Programme on the Elimination of Child Labour (IPEC) in 1999, created a department of fight against child labour in 2006 and raised the minimum age for admission to employment from 14 to 16 years. This paper supports a critical view of global actions to fight child labour and discusses the complexities of this issue in Burkina Faso. Using an analysis of the State’s National Plan of Action on the elimination of child Labour and two local cases studies on projects that are aimed at removing children from their work, it shows how the local context of working children and their parents are ignored in order to comply with international policy agenda and to cater to donor demands. [less ▲]

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See detailParticipation à une table ronde
Henneau, Marie-Elisabeth ULg

Conference (2011, April 07)

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Peer Reviewed
See detailEast Asian Social Enterprises in a Worldwide Perspective
Defourny, Jacques ULg

Conference (2011, April 07)

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See detailEmotion, corps et conscience magique chez Sartre
Cormann, Grégory ULg

Conference (2011, April 06)

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See detailLe DouglasModel et nos futurs projets CAPSIS
Ligot, Gauthier ULg; Perin, Jérôme ULg; de Pierpont, Astrid ULg

Conference (2011, April 06)

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See detailL'entrepreneuriat social et l'économie sociale
Defourny, Jacques ULg

Conference (2011, April 06)

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See detailOndes de choc et pathologies abarticulaires
Kaux, Jean-François ULg

Conference (2011, April 06)

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See detailExplanation of the extreme low surface mass balance over the Greenland ice sheet in 2010 with the help of a regional climate model and a circulation type classification.
Fettweis, Xavier ULg; van den Broeke, Michiel; van de Berg, Willem Jan et al

Conference (2011, April 06)

The regional climate models MAR and RCMO show that the surface mass balance (SMB) rate of the whole Greenland ice sheet (GrIS) is the lowest in 2010 since 50 years. This record is a combination of an ... [more ▼]

The regional climate models MAR and RCMO show that the surface mass balance (SMB) rate of the whole Greenland ice sheet (GrIS) is the lowest in 2010 since 50 years. This record is a combination of an abnormal dry year and an exceptional melt in summer confirmed by ground measurements and satellite-derived observations. An automated circulation type classification (CTC) is used for detecting anomalies in the daily atmospheric circulation at 500hPa over the Greenland ice sheet during 2010. The CTC reveals that the low snow accumulation is due to the general circulation (negative NAO index) while the record melt in summer is rather a consequence of the well known surface albedo-temperature feedback induced by - a warmer and thinner than normal snowpack above the bare ice at the end of the spring. - an earlier beginning of the melt season. - a drier summer. - an exceptional persistence of atmospheric circulations inducing warm and dry conditions over the GrIS. All these anomalies induced in summer 2010 an exceptional time exposure of bare ice areas (with a lower albedo than snow) over the GrIS which impacts the surface melt. Sensitivity experiments carried out by the MAR model allow to estimate the importance of each anomaly in the record simulated melt of summer 2010. [less ▲]

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See detailPegase, a model dedicated to Surface WAter Quality Assessment that helps stakeholders implementing the WFD
Deliège, Jean-François ULg; Grard, Aline ULg; Everbecq, Etienne ULg et al

Conference (2011, April 06)

Pegase, a model dedicated to surface water quality assessment that helps stakeholders implementing the WFD. That presentation showed 2 different applications directly made by the stakeholders in charge of ... [more ▼]

Pegase, a model dedicated to surface water quality assessment that helps stakeholders implementing the WFD. That presentation showed 2 different applications directly made by the stakeholders in charge of the water management at the basin scale. The end-users analysed results of the Pegase model in the scope of implementation of the WFD. Differents scenarios were build in order to simulate the way to reach the good status for water bodies. Associated costs were estimated and relevant decisions were oriented using the results of the numerical Pegase tool. [less ▲]

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See detailAssimilation of the 1979-2009 microwave satellite data into the regional climate MAR model for studying the Greenland ice sheet melt extent
Fettweis, Xavier ULg; Tedesco, Marco; van den Broeke, Michiel

Conference (2011, April 05)

The 1979-2009 melt extent derived from the amount of produced meltwater by day simulated by the regional climate model MAR and derived from the spaceborne microwave 19GHz horizontal polarizated (T19H ... [more ▼]

The 1979-2009 melt extent derived from the amount of produced meltwater by day simulated by the regional climate model MAR and derived from the spaceborne microwave 19GHz horizontal polarizated (T19H) brightness temperature compares well over the Greenland ice sheet (GrIS). However, some disagreements still occur in some pixels for any days. Therefore, we run the MAR model in an assimilation mode, constrained by the daily SMMR-SSM/I derived melt extent over 1979-2009. As assimilation, we change the MAR near-surface snowpack temperature for the pixels where MAR and satellite disagree. This correction allows to conserve the water equivalent of the snowpack mass in MAR while having a full agreement between model and satellite derived melt extent. The assimilation helps to improve the meltwater production simulation as well as the matching with other satellite data sets (MODIS, GRACE, ...), with the objective to reduce the uncertainties of the current SMB model-based estimates over the GrIS. [less ▲]

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See detailMerging satellite and in situ sea surface temperature data using DINEOF
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Beckers, Jean-Marie ULg

Conference (2011, April 05)

High quality sea surface temperature data sets are needed for various applications, including numerical weather prediction, ocean forecasting and climate research. The coverage, resolution and precision ... [more ▼]

High quality sea surface temperature data sets are needed for various applications, including numerical weather prediction, ocean forecasting and climate research. The coverage, resolution and precision of individual sea surface temperature observations is not sufficient for these applications, therefore merging of complementary data sets is needed to increase the coverage and to reduce the final data set error. DINEOF (Data Interpolating Empirical Orthogonal Functions) is an EOF-based technique to reconstruct missing information -due to clouds, for example in satellite data sets. A new development of this method consists in its capability to merge different data sources into one estimate. This development is tested using AVHRR data of the western Mediterranean Sea and in situ data from various international databases (World Ocean Database (WOD), MEDAR/Medatlas, Coriolis Data Center, International Council for the Exploration of the Sea (ICES) and International Comprehensive Ocean-Atmosphere Data Set (ICOADS)). An error assessment between the satellite and in situ data is performed first, in order to determine the error statistics between these two data sources. The error is calculated by database, platform type (CTD, XBT, drifters, bottles and ships) and depth. This error assessment is used to merge the in situ and satellite data. The impact of the sensor-specific errors on the quality of the final product will be assessed, and compared to the results obtained when the same error estimate is used for all sensors. The benefit of using in situ data in addition to satellite data will be also discussed. Additional information can be found at http://modb.oce.ulg.ac.be/mediawiki/index.php/DINEOF and http://gherdiva.phys.ulg.ac.be/DINEOF/ [less ▲]

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See detail"L'archive comme espace de re-création"
Belloi, Livio ULg

Conference (2011, April 05)

Cette communication se propose d'aborder l'archive comme un espace de re-création pour divers artistes contemporains. Elle se concentre sur les œuvres récentes du cinéaste autrichien Gustav Deutsch ... [more ▼]

Cette communication se propose d'aborder l'archive comme un espace de re-création pour divers artistes contemporains. Elle se concentre sur les œuvres récentes du cinéaste autrichien Gustav Deutsch, nommément "Welt Spiegel Kino" (2005) et "Film ist. a girl & a gun" (2009), qui réaniment littéralement le patrimoine cinématographique, lui conférant une urgence nouvelle. [less ▲]

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